【摘要】 本文通过对高压电压互感器高低压侧等值电路分析,提出了低压侧参考误差方法实现电压互感器误差测试原理,通过常规方法在一个较低电压下测量电压互感器空载误差及其固定电阻下的负载误差、一次侧绕组直流电阻和二次回路参考电压点和测试点的参考误差,计算得到互感器在各种负荷下的误差数据。本方法无需使用升压器和进行导纳值测量,并避免了分布电容对误差的影响,试验结果表明测量准确度可以达到检定规程要求。更多还原

【Abstract】 According to the equivalent circuits of PT,a principle of PT’s error test based on referenced error in 2nd side is provided.Through measuring the values,such as errors under no-load and a fixed resistance at a low level reference voltage in common method,DC resistance of 1st side winding and referenced errors of reference and test voltages etc.,the PT’s errors under different loads are calculated.It is unnecessary to measure the exciting impedance and to equip the test transformer in this method.And the effect of the distributing capacitance is avoided in test principle.It is indicated that the uncertainty can be kept within a tenth of error tolerance of tested PT from the test results.更多还原